NPCs composing that spawngroup :

Invisman (100%)

NPCs spawning around that spawngroup :
(Max range : 100)

skyshrine_94, range=43 (566,-326,324)

Xalamesh_Dur`Kven (100%)

skyshrine_98, range=68 (550,-290,43)

Welenor (50%)
Welenor (50%)

skyshrine_99, range=46 (578,-290,43)

Lumburus (50%)
Lumburus (50%)

skyshrine_103, range=83 (624,-243,43)

Sorcerer_Qren (50%)
Sorcerer_Qren (50%)

skyshrine_104, range=91 (649,-243,43)

Ilsuaand (50%)
Ilsuaand (50%)

skyshrine_107, range=93 (654,-407,43)

Flack (50%)
Flack (50%)

skyshrine_110, range=41 (605,-366,43)

Ortoth (100%)

skyshrine_112, range=49 (582,-366,43)

Tasznev (50%)
Tasznev (50%)

a_patient_servant_189886, range=51 (558,-327,48)

A_Guardian_of_the_Shrine (100%)

skyshrine_112917, range=71 (538,-333,28)